//
// Copyright © 2025 Hardcore Engineering Inc.
//
// Licensed under the Eclipse Public License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License. You may
// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
//

import type { Window } from '@hcengineering/communication-types'

import type { PagedQuery } from './types'

export class WindowImpl<T> implements Window<T> {
  constructor (
    private readonly result: T[],
    private readonly total: number,
    private readonly isTail: boolean,
    private readonly isHead: boolean,
    private readonly query: PagedQuery<T>
  ) {}

  getResult (): T[] {
    return this.result
  }

  getTotal (): number {
    return this.total
  }

  async loadNextPage (): Promise<void> {
    if (!this.hasNextPage()) return
    await this.query.requestLoadNextPage()
  }

  async loadPrevPage (): Promise<void> {
    if (!this.hasPrevPage()) return
    await this.query.requestLoadPrevPage()
  }

  hasNextPage (): boolean {
    return !this.isTail
  }

  hasPrevPage (): boolean {
    return !this.isHead
  }
}
